Buggy code:
public class RegistrationForm extends VerticalLayout { private static final long serialVersionUID = 6837549393946888607L ; private static final String EMAIL_PATTERN = "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@" + "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$" ; private Pattern emailPattern = Pattern . compile ( RegistrationForm . EMAIL_PATTERN ) ; private Log log = LogFactory . getLog ( RegistrationForm . class ) ; final Label feedbackLabel = new Label ( ) ; public RegistrationForm ( ) { } private void register ( TextField username , PasswordField password , PasswordField verifyPassword , TextField realName , TextField email , TextField captchaCode ) throws PasswordRequirementException , PasswordsDoNotMatchException , TooShortPasswordException , TooShortUsernameException , UsernameExistsException { } private void sendMail ( User user ) throws MessagingException { String title = "Registration<seq2seq4repair_space>Confirmation<seq2seq4repair_space>for<seq2seq4repair_space>Your<seq2seq4repair_space>geWorkbench<seq2seq4repair_space>Account" ; String realName = user . getName ( ) ; if ( ( realName . length ( ) ) == 0 ) realName = "Guest" ; String hrefStr = ( ( ( ( this . getApplication ( ) . getURL ( ) . toString ( ) ) + "servlet//ConfirmUser?userID=" ) + ( user . getId ( ) ) ) + "&key=" ) + ( user . getReasonForLockedAccount ( ) . split ( "\\(" ) [ 0 ] ) ; <START_BUG> String content = ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( "<font<seq2seq4repair_space>face=\"Monogram\">Welcome<seq2seq4repair_space>" + realName ) + "!<p>" ) + "Thanks<seq2seq4repair_space>for<seq2seq4repair_space>signing<seq2seq4repair_space>up<seq2seq4repair_space>with<seq2seq4repair_space>geWorkbench-web!" ) + "<p>Here<seq2seq4repair_space>is<seq2seq4repair_space>your<seq2seq4repair_space>geWorkbench<seq2seq4repair_space>account<seq2seq4repair_space>information:<seq2seq4repair_space>" ) + "<p>User<seq2seq4repair_space>name:<seq2seq4repair_space>" ) + ( user . getUsername ( ) ) ) + "<br>Real<seq2seq4repair_space>name:<seq2seq4repair_space>" ) + ( user . getName ( ) ) ) + "<br>Email:<seq2seq4repair_space>" ) + ( user . getEmail ( ) ) ) + "<p>Please<seq2seq4repair_space>click<seq2seq4repair_space>on<seq2seq4repair_space>the<seq2seq4repair_space>following<seq2seq4repair_space>link<br>" ) + "<a<seq2seq4repair_space>href=\"" ) + hrefStr ) + "\"<seq2seq4repair_space>>" ) + hrefStr ) + "<a>" ) + "<br>to<seq2seq4repair_space>activate<seq2seq4repair_space>your<seq2seq4repair_space>geWorkbench-web<seq2seq4repair_space>account." ) + "<p>If<seq2seq4repair_space>the<seq2seq4repair_space>above<seq2seq4repair_space>link<seq2seq4repair_space>is<seq2seq4repair_space>not<seq2seq4repair_space>clickable<seq2seq4repair_space>in<seq2seq4repair_space>your<seq2seq4repair_space>email,<seq2seq4repair_space>please<seq2seq4repair_space>copy<seq2seq4repair_space>and<seq2seq4repair_space>paste<seq2seq4repair_space>it<seq2seq4repair_space>to<seq2seq4repair_space>the<seq2seq4repair_space>browser<seq2seq4repair_space>address<seq2seq4repair_space>bar<seq2seq4repair_space>to<seq2seq4repair_space>finish<seq2seq4repair_space>the<seq2seq4repair_space>confirmation<seq2seq4repair_space>process." ) + "<p>Thank<seq2seq4repair_space>you,<br>The<seq2seq4repair_space>geWorkbench<seq2seq4repair_space>Team<//font>" ; <END_BUG> Emailer emailer = new Emailer ( ) ; emailer . send ( user . getEmail ( ) , title , content ) ; } }

Fix:
String content = ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( "<font<seq2seq4repair_space>face=\"Monogram\">Welcome<seq2seq4repair_space>" + realName ) + "!<p>" ) + "Thanks<seq2seq4repair_space>for<seq2seq4repair_space>signing<seq2seq4repair_space>up<seq2seq4repair_space>with<seq2seq4repair_space>geWorkbench-web!" ) + "<p>Here<seq2seq4repair_space>is<seq2seq4repair_space>your<seq2seq4repair_space>geWorkbench<seq2seq4repair_space>account<seq2seq4repair_space>information:<seq2seq4repair_space>" ) + "<p>User<seq2seq4repair_space>name:<seq2seq4repair_space>" ) + ( user . getUsername ( ) ) ) + "<br>Real<seq2seq4repair_space>name:<seq2seq4repair_space>" ) + ( user . getName ( ) ) ) + "<br>Email:<seq2seq4repair_space>" ) + ( user . getEmail ( ) ) ) + "<p>Please<seq2seq4repair_space>click<seq2seq4repair_space>on<seq2seq4repair_space>the<seq2seq4repair_space>following<seq2seq4repair_space>link<br>" ) + "<a<seq2seq4repair_space>href=\"" ) + hrefStr ) + "\"<seq2seq4repair_space>>" ) + hrefStr ) + "<//a>" ) + "<br>to<seq2seq4repair_space>activate<seq2seq4repair_space>your<seq2seq4repair_space>geWorkbench-web<seq2seq4repair_space>account." ) + "<p>If<seq2seq4repair_space>the<seq2seq4repair_space>above<seq2seq4repair_space>link<seq2seq4repair_space>is<seq2seq4repair_space>not<seq2seq4repair_space>clickable<seq2seq4repair_space>in<seq2seq4repair_space>your<seq2seq4repair_space>email,<seq2seq4repair_space>please<seq2seq4repair_space>copy<seq2seq4repair_space>and<seq2seq4repair_space>paste<seq2seq4repair_space>it<seq2seq4repair_space>to<seq2seq4repair_space>the<seq2seq4repair_space>browser<seq2seq4repair_space>address<seq2seq4repair_space>bar<seq2seq4repair_space>to<seq2seq4repair_space>finish<seq2seq4repair_space>the<seq2seq4repair_space>confirmation<seq2seq4repair_space>process." ) + "<p>Thank<seq2seq4repair_space>you,<br>The<seq2seq4repair_space>geWorkbench<seq2seq4repair_space>Team<//font>" ;